#include <stdio.h>
int sub(int x, int y);
int add(int x, int y);
int multi(int x, int y);
int main(){
    printf("sub(4,3) = %d\n", sub(4,3));
    printf("add(4,3) = %d\n", add(4,3));
    printf("multi(4,3) = %d\n", multi(4,3));
}
